Problem Possible Cause Action
Meter resets 1. Intermittent power
2. Electromagnetic
interference (EMI)
1. Measure the power input voltage
2. Check Power input and output cables
grounding and routing.
3. Check meter power cycles value
4. Press and release F1 and F2 at the same
time; the display will enter Engineering
screens.
5. Press F1 to get to screen #23; record power
cycle value.
6. Press F4 to return to normal operation;
monitor meter until problem returns.
7. Return to screen #23 to see if power cycles
have increased; microprocessor is resetting
due to EMI electrical noise entering the meter.
Flow measurement is
erratic or fluctuating
1. Very turbulent flow
2. Sensor dirty
3. Sensor broken
4. Probe not mounted
securely
5. Malfunction in flow meter
6. Meter installed incorrectly
1. Increase dampening (see filter settings in
"Flow Parameters" on p. 51)
2. Clean sensor (Refer to Maintenance section,
p. 79)
3. Return flow meter to ONICON for repair
(Refer to p. 93 for shipping instructions)
4. Remount probe (see Installation section, p.
18); must be mounted securely without
vibration. If vibration persists, choose a new
mounting location without vibration.
5. Return flow meter to ONICON for repair
(Refer to p. 93 for shipping instructions)
6. Re-install meter according to instructions
(Refer to installation section, p. 18)
11451 Belcher Road South, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax +1 (727) 442-5699 • sales@onicon.com
F-5500 Thermal Mass Flow Meter Manual 06/17 - 2030 / 107023 Page 81
Model F-5500
TROUBLESHOOTING
Model F-5500
TROUBLESHOOTING
Troubleshooting: General
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